Hi,I have connected 4 channels, A and B master, bass boost and open/focused functions on my Engl Powerball V1 to loop number5, 6, 7 and 8 on the GCX using Y cables. So far its working, but i get a ground hum that is not wanted.I have not done anything regarding latched or momentary configurations.I would be happy for a little guidance on this

I tried guitar in in the front and out on loop 1 and also in and out on loop 1. Without any effects connected.I have not connected anything in the rack yet. I first wanted to get rid of the ground hum.I plan to use loop 1, 2, 3, and 4 with stomp boxes.

So now I tried to connect just the effect loop on the Engl to loop nr 4 in the GCX with the same result. It seems like the hum comes whenever i connect the GCX in anyway.I tested the effect loop on the amp just to make shure, with no connection with the GCX, and it works fine.

OK, so now you have only the amp FX Loop running thru a GCX Loop and still getting the same buzz? Are the connections as follows:1. Guitar directly to the Amp Instrument Input.2. Amp FX Send to GCX Loop In.3. GCX Loop Out to Amp FX Return.

If so, it is difficult to see how this could be a ground loop buzz with no other path for ground... how loud is this noise compared to the guitar level? Have you tried the above setup with a different set of cables just to be certain there isn't one with a failing shield?

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